Index: source/Plugins/Platform/MacOSX/PlatformDarwin.h
===================================================================
--- source/Plugins/Platform/MacOSX/PlatformDarwin.h
+++ source/Plugins/Platform/MacOSX/PlatformDarwin.h
@@ -85,6 +85,12 @@
   static std::tuple<llvm::VersionTuple, llvm::StringRef>
   ParseVersionBuildDir(llvm::StringRef str);
 
+  enum class SDKType {
+    MacOSX = 0,
+    iPhoneSimulator,
+    iPhoneOS,
+  };
+
 protected:
   void ReadLibdispatchOffsetsAddress(lldb_private::Process *process);
 
@@ -95,12 +101,6 @@
       const lldb_private::FileSpecList *module_search_paths_ptr,
       lldb::ModuleSP *old_module_sp_ptr, bool *did_create_ptr);
 
-  enum class SDKType {
-    MacOSX = 0,
-    iPhoneSimulator,
-    iPhoneOS,
-  };
-
   static bool SDKSupportsModules(SDKType sdk_type, llvm::VersionTuple version);
 
   static bool SDKSupportsModules(SDKType desired_type,
Index: source/Plugins/Platform/MacOSX/PlatformDarwin.cpp
===================================================================
--- source/Plugins/Platform/MacOSX/PlatformDarwin.cpp
+++ source/Plugins/Platform/MacOSX/PlatformDarwin.cpp
@@ -1402,14 +1402,11 @@
   if (last_path_component) {
     const llvm::StringRef sdk_name = last_path_component.GetStringRef();
 
-    llvm::StringRef version_part;
-
-    if (sdk_name.startswith(sdk_strings[(int)desired_type])) {
-      version_part =
-          sdk_name.drop_front(strlen(sdk_strings[(int)desired_type]));
-    } else {
+    if (!sdk_name.startswith(sdk_strings[(int)desired_type]))
       return false;
-    }
+    auto version_part =
+        sdk_name.drop_front(strlen(sdk_strings[(int)desired_type]));
+    version_part.consume_back(".sdk");
 
     llvm::VersionTuple version;
     if (version.tryParse(version_part))
Index: unittests/Platform/PlatformDarwinTest.cpp
===================================================================
--- unittests/Platform/PlatformDarwinTest.cpp
+++ unittests/Platform/PlatformDarwinTest.cpp
@@ -18,6 +18,13 @@
 using namespace lldb;
 using namespace lldb_private;
 
+struct PlatformDarwinTester : public PlatformDarwin {
+  static bool SDKSupportsModules(SDKType desired_type,
+                                 const lldb_private::FileSpec &sdk_path) {
+    return PlatformDarwin::SDKSupportsModules(desired_type, sdk_path);
+  }
+};
+
 TEST(PlatformDarwinTest, TestParseVersionBuildDir) {
   llvm::VersionTuple V;
   llvm::StringRef D;
@@ -44,4 +51,23 @@
 
   std::tie(V, D) = PlatformDarwin::ParseVersionBuildDir("3.4.5");
   EXPECT_EQ(llvm::VersionTuple(3, 4, 5), V);
+
+  std::string base = "/Applications/Xcode.app/Contents/Developer/Platforms/";
+  EXPECT_TRUE(PlatformDarwinTester::SDKSupportsModules(
+      PlatformDarwin::SDKType::iPhoneSimulator,
+      FileSpec(base +
+          "iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator12.0.sdk",
+          false)));
+  EXPECT_FALSE(PlatformDarwinTester::SDKSupportsModules(
+      PlatformDarwin::SDKType::iPhoneSimulator,
+      FileSpec(base +
+          "iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.2.sdk",
+          false)));
+  EXPECT_TRUE(PlatformDarwinTester::SDKSupportsModules(
+      PlatformDarwin::SDKType::MacOSX,
+      FileSpec(base + "MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk",
+               false)));
+  EXPECT_FALSE(PlatformDarwinTester::SDKSupportsModules(
+      PlatformDarwin::SDKType::MacOSX,
+      FileSpec(base + "MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk", false)));
 }